Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Taxes [Line Items]
Income tax expense (benefit)	$ (0.5)	$ 0.5	$ 0.4	$ (6.7)
U.S. Federal NOLs
Income Taxes [Line Items]
Net operating loss carry forwards					$ 871.8
Net operating loss expiration period					20 years
Net operating loss carry forwards expiration year					Dec. 31, 2027
Non-U.S. NOLs
Income Taxes [Line Items]
Net operating loss carry forwards					$ 27.6